浮选柱在磁赤混合铁矿反浮选中的试验研究

采用微泡逆流接触式浮选柱对某赤铁矿选厂的低品位混磁精矿进行了提高精矿品位的反浮选试验研究。通过条件试验确定的浮选柱操作条件为给矿速度847mL/min,给矿浓度35%,充气量4.0m3/h,泡沫层高度30mm;药剂用量为NaOH 1250g/t、淀粉1200g/t、活化剂CaO 600g/t、捕收剂GK-58 650g/t。结果表明,给矿品位为42.15%的磁选精矿,经过浮选柱一次粗选即得到精矿品位为65.82%、回收率62.79%的良好选别指标。试验数据可为赤铁矿浮选流程中浮选柱的应用提供一定的参考依据。     

庙沟铁矿阳离子反浮选工艺工业试验探索

随着庙沟铁矿露天开采接近尾声,品位低、嵌布粒度细的磁铁石英岩比例增加,矿石难磨难选。为此,该矿进行了铁精矿阳离子反浮选工业试验,其结果表明在入浮选铁精粉品位65.42%的情况下,获得了铁精矿品位68.05%,尾矿铁品位23.56%,精矿中SiO2含量为4.5%的理想选别指标。     

某磁选铁精矿浮选柱阳离子反浮选试验

冀东某选矿厂磁选铁精矿粒度较细（-0.074 mm占91.60%）,铁矿物单体解离度高达94.4%,且在细粒级明显富集。为了进一步提高该精矿铁品位,以现场流程精矿为试样、以微泡逆流接触式浮选柱为分选设备、以GE-609为阳离子反浮选捕收剂,进行了提铁降硅试验。结果表明,在粗选给矿浓度为35%、给矿速度为893 mL/min、GE-609用量为60 g/t、充气量为2.0 L/min、泡沫层高度为30 cm情况下,采用1粗2扫、中矿顺序返回流程处理该试样,可获得铁品位为68.12%、铁回收率为98.88%的铁精矿,尾矿铁品位仅为9.92%,表明微泡逆流接触式浮选柱和阳离子捕收剂GE-609适用于该试样的反浮选提铁降硅。     

司家营铁矿磁赤混合铁矿的阳离子反浮选降硅正交试验

为了简化流程,降低成本,以淀粉为抑制剂,GE-609为捕收剂,对司家营铁矿选矿厂的混磁精矿进行了阳离子反浮选降硅试验研究.试验中采用二因素二水平的正交试验考查了抑制剂及捕收剂用量对反浮选效果的影响,最后确定的药剂制度为粗选淀粉用量1500g/t,GE-609用量300 g/t.闭路流程试验结果表明,采用一次粗选、一次精选、两次扫选的浮选流程,可获得品位65.10％、回收率85.39％的铁精矿,尾矿品位降至11.91％,实现了低成本条件下的资源高效回收.     

司家营铁矿磁选精矿阳离子反浮选试验研究

河北钢铁集团矿业有限公司司家营铁矿选矿厂采用以NaOH为pH调整剂、淀粉为抑制剂、石灰为活化剂、GK-68为捕收剂的阴离子反浮选工艺处理弱磁选和强磁选所得混合精矿,存在药剂制度复杂且矿浆需加温的弊端。为此,从武汉理工大学研制的阳离子捕收剂GE-609和中南大学研制的阳离子捕收剂HYS-2中筛选出GE-609对司家营铁矿选矿厂磁选混合精矿进行了阳离子反浮选试验,并模拟现场流程和药剂制度进行了阴离子反浮选对比试验。试验结果表明,在常温和不改变原有流程结构的情况下,GE-609仅与淀粉1种药剂配合,可获得铁品位为65.37%、铁回收率为84.10%的最终铁精矿,而模拟阴离子反浮选在40 ℃下所获最终铁精矿的铁品位为65.55%、铁回收率为79.44%。由此可见,采用GE-609进行阳离子反浮选不仅可达到实现常温浮选和简化药剂制度的目的,还可较大幅度地提高铁的回收率。     

海南某赤铁矿柱式反浮选试验

为了提高海南某赤铁矿选厂的磁选精矿品位,进行了旋流-静态微泡浮选柱阴离子反浮选试验研究,通过条件试验确定的浮选柱给料速度为230 mL/min,捕收剂用量1 800 g/t,粗选循环泵压力0.14 Mpa,浮选浓度38%,粗选浮选柱吸气量1.0 m³/h。试验结果表明：在给矿品位49.44%的条件下,采用脱硫+1粗1扫反浮选流程,获得了精矿产率为57.37%、铁精矿品位62.62%、铁回收率72.66%的较好指标。试验体现了浮选柱在赤铁矿浮选中分选流程短和分选效率高的优势。     

司家营铁矿原生矿阳离子反浮选工艺试验研究

司家营铁矿原生矿磨矿系统技改后系统产能大幅度提升,受后续选别作业能力的影响,三磁精矿品位波动较大,并最终影响精矿指标的稳定。生产上为了平衡系统处理能力,采用了局部阴离子反浮选工艺,但成本较高。为了降低反浮选工艺系统的生产成本,根据国内阳离子捕收剂应用现状,选用GE609与S 1进行了实验室对比试验及GE609工业试验。工业试验表明,GE609在用量为160.46 g/t的条件下,取得了精矿品位为68.67%,尾矿品位为21.44%,金属回收率为94.60%的较理想指标。与阴离子反浮选工艺相比,阳离子反浮选只需添加1种药剂,药剂制度单一,可操作性强,具有较明显的优势。     

海南某难选铁矿石磁选——浮选试验研究

针对海南某铁矿山不断开采、矿石品质下降的问题,提出采用铁矿石分质分选的新思路,开展了弱磁选富集磁铁矿、反浮选回收赤铁矿的工艺流程试验。结果表明:原矿经过磨矿(-0.074mm占54.21%)—一段弱磁选(79.58k A/m)—弱磁精矿再磨(-0.045mm占63.82%)—二段弱磁选(79.58k A/m)获得铁品位62.42%、回收率19.28%的弱磁精矿,对一段弱磁尾矿经强磁选获得的强磁精矿与二段弱磁尾矿合并为混磁精矿,混磁精矿再磨至-0.045mm占85.52%,以淀粉为抑制剂、Ca Cl₂为调整剂、Ts-2为捕收剂,经1粗1精3扫闭路反浮选,获得铁品位60.60%、回收率36.23%的浮选精矿。弱磁精矿和浮选精矿中铁矿物分别主要以磁铁矿和赤铁矿形式存在,主要脉石矿物皆为石英。     

浮选柱的发展与生产实践

介绍了浮选柱发展历史、工作原理和主要技术参数，结合国内外研制进展和生产实践，分析其优势与局限性，提出了浮选柱的发展方向。     

充填浮选柱在赤铁矿反浮选中的应用试验研究

根据充填浮选柱的优势,将加以充填介质的微泡逆流接触式浮选柱应用于赤铁矿的反浮选流程中,在操作条件和药剂制度条件试验的基础上,确定了一粗一精一扫的浮选流程。对于给矿品位为42.15%的混磁精矿,可以得到精矿品位为67.05%、尾矿品位为11.25%的选别指标,可为充填浮选柱在赤铁矿浮选流程中的应用提供一定的参考依据。     

加拿大某磁铁矿脱除磁黄铁矿浮选试验研究

根据加拿大某磁铁矿的原矿性质,进行了脱除磁黄铁矿浮选试验研究。采用硫酸+硫酸铜作为活化剂,异戊黄药+丁铵黑药作为捕收剂,BK204作为起泡剂,可以实现磁铁矿与磁黄铁矿的分离。实验室闭路浮选试验获得铁精矿铁品位67.51%,铁回收率92.69%,铁精矿硫品位0.16%,硫脱除率94.72%的选别指标。     

某低品位金铜矿石浮选柱应用试验研究

某低品位金铜矿石含铜0.46%、金0.18 g/t,矿石中铜矿物主要以蓝辉铜矿、辉铜矿、铜蓝、硫砷铜矿等次生铜矿物存在,其可浮性好但容易过磨,造成浮选时细粒级损失较高,试验采用浮选柱+浮选机联合选别与单独采用浮选机相比,其它指标相当的情况下,铜精矿品位提高9.6%,硫精矿回收率提高9.23%,试验表明浮选柱对提高精矿品质、简化流程和强化细粒级回收方面具有较为明显地优势。     

Utilization of humic acid as a depressant for hematite in the reverse flotation of iron ore

In the present work the utilization of humic acid as a depressant for hematite in the iron ore flotation process was studied taking into consideration its physicochemical properties. Contact angle measurements of hematite and quartz were performed using a computer controlled Ramé-Hart goniometer. After conditioning with humic acid at pH 10.2, at low dodecylamine concentrations, hematite presented a much lower contact angle as compared to that of quartz under the same conditions.Microflotation tests were carried out using an EMDEE flotation apparatus. Initially, the two minerals were studied individually. The results showed that, depending of the humic acid and dodecylamine concentrations, the floatability of quartz was higher than 90% and 61% of the hematite was depressed. The flotation of the mixture of the two minerals (25% quartz and 75% hematite) was subsequently studied. The hematite recovery was higher than 90% in the depressed concentrate which assayed 86.0% Fe₂O₃. The results suggest that humic acid could be used as an alternative for starch in the iron ore flotation process.     

Effect of amine and starch dosages on the reverse cationic flotation of an iron ore

In iron ore concentration, reverse cationic flotation of quartz has been successfully employed for particles below 150 μm previously deslimed. Amine and starch are used, respectively, as quartz collector and iron oxides depressant. Understanding the mechanisms of reagents interaction is relevant to improve the separation selectivity, especially for high amine dosages. The term clathrate was used to explain this interaction, meaning a molecular compound in which molecules of one species occupy the empty spaces in the lattice of the other species, resulting in the depression of hydrophobic minerals. Laboratory scale experiments were carried out with itabirite iron ore in three different size ranges. The clathrate formation between molecules of amine and starch may explain the increase of SiO₂ content in the concentrates of the coarse size range (−150 + 45 μm) due to an increase in amine dosage.     

The use of collectors mixture in the reverse cationic flotation of magnetite ore: The role of Fe-bearing silicates

The paper describes effective reagent combinations for removal of silicates by reverse cationic flotation from magnetic concentrate in magnetite ores processing. This work is based on a hypothesis that a further development in reverse cationic flotation of iron ores implies, a more detailed consideration of the nature of the Fe-bearing gangue minerals. Thus, the choice of reagent regime has been determined by the similar physicochemical properties of iron oxides and silicates such as amphiboles due to inclusion of iron into their crystal lattice. Zeta-potential studies of Fe-oxides, quartz and Fe-bearing amphibole samples have shown that amines of different molecular structure are equally well adsorbed both on the surface of Fe-oxides and on the surface of silicates within рН range of 4–10. Flotation studies of quartz and Fe-bearing amphibole samples have revealed that the use of starch as a depressant of Fe-oxides has a hydrophilic effect on the surface of Fe-bearing silicates and significantly decreases their flotation by ether amines. Flotation of these minerals is not possible by primary monoamines in the presence of starch due to the adsorption layer formation.The experimentally selected mixtures of ether amines with primary monoamines or with alcohols provide formation of a hydrophobic adsorption layer on the surface of amphiboles and magnetite–silicate aggregates, even in the presence of starch in the system. A total hydrophobic effect is sufficient for an effective flotation of the entire silicate complex and producing of magnetite concentrates with SiO₂ content <1.0% and Fe content up to 70.3% from magnetic concentrate with SiO₂ content ～3%.     

某赤铁矿强磁—反浮选试验研究

该矿石中主要铁矿物为赤铁矿、褐铁矿,脉石主要为石英、角闪石。有害杂质硫含量很低,但磷含量偏高。针对矿石性质和特点以及我国目前选矿技术发展的现状,采用强磁—反浮选流程进行分选试验。结果表明,在原矿铁品位为37.10%的情况下,可获得铁精矿品位62.10%,回收率72.20%的良好选别指标。     

云南某低品位硫氧混合型铜矿浮选试验研究

云南某铜矿,铜品位仅0.47%,氧化率为23.02%;矿物组成虽简单,但对浮选有害的碱性脉石矿物含量较高;总体来看,该矿属低品位难选硫氧混合型铜矿。针对该矿的性质特点,对其进行了浮选试验研究,结果表明:在丁黄药 丁铵黑药(2:1)组合作为捕收剂、其用量150g/t,磨矿细度85%-200目,活化剂硫化钠用量500 g/t的条件下,采用“一粗-一扫-三精”浮选工艺,可获得较好的技术指标,最终铜精矿品位和回收率高达17.56%和90.80%,为低品位难选硫氧混合型铜矿资源的开发利用提供了有力的参考依据。      

高磷铁精矿原浆反浮选提质降磷试验研究

云南某铁精矿中磷含量为0.45%,铁品位57.08%,铁矿物以磁铁矿和赤铁矿为主,磷组分以磷灰石的形态存在且嵌布细度细。对该高磷铁精矿进行了提质降磷试验研究。试验研究结果表明:以氢氧化钠调浆至pH=9左右,木质素(150 g/t)和淀粉(300 g/t)作组合抑制剂,CB为新型捕收剂(20 g/t),采用原浆反浮选后,一次粗选可实现铁精矿中磷的有效脱除,最终获得品位58.75%,磷含量0.23%,铁回收率约为85%的反浮选指标,可望为控亏、企业减亏提供了一条有效的途径。     

The entrainment effect on the performance of iron ore reverse flotation

An iron ore mineral processing plant in Brazil treating Itabirite ore was assessed by sampling a circuit consisting of Wemco 144 mechanical cells, as part of the AMIRA P9P collaborative research project. This paper presents and discusses the results of entrainability, water recovery and quartz and hematite grades associated to hydrodynamic parameters. The results indicated strong correlation between water recovery and hematite losses which was intensified by the operating conditions of the circuit.A potential alternative to reduce the hematite losses through entrainment and to increase quartz removal was to modify the traditional circuit design to treat rougher and cleaner/recleaner tails in different stages. In addition, the scavenger residence time must be matched to the quartz floatability. Changes to design and operation of these circuits are needed to sustain concentrate recovery and grade as iron ores become finer.